<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>div标签</title>
    <style>
        div {
            width: 300px;
            height: 300px;
            background-color: aquamarine;
            margin: 0 auto;   /* 版心居中，auto表示系统自动居中对齐 */
            padding: 20px;
            border: 1px solid red;   /* 边框，solid表示实线 */
            border-radius: 50%;    /* 圆角弧度，圆形为50%*/
            background-image: url(./images/ikun.png);
            background-size: contain;
        }
        body {
            margin: 0;
            padding: 0;
        }
    </style>
</head>
<body>
    <div>
        <p style="text-align: center;">第一个盒子</p>
    </div>
</body>
</html>